Abstract: 2,2-BIS-(ALKYL-4'-HYDROXYPHENYL)-CYCLOALKYL-(ALKYL) CARBONIC ACID ESTERS ARE PREPARED BY CONDENSATION OF ALKYL PHENOLS WITH 2-KETO-CYCLOALKYL CARBONIC ACID ESTERS IN THE PRESENCE OF ACIDIC CATALYSTS AND OPTIONALLY OF MERCAPTO DERIVATIVES. The product are useful for the stabilization of polymers against the decomposition by light and heat.

Abstract: Certain aza-adamantane compounds are suitable for stabilizing polymers against degradation by light and heat.It is known that ultraviolet radiation, especially in the near-ultraviolet range, has an adverse effect on the aspect and physical properties of organic polymers. Thus, for example, polyolefins and polyurethane elastomers tend to heavy degradation when they are exposed to light, that is, sun rays or ultraviolet radiation. Polyvinyl chloride and polyvinylidene chloride are discolored and also degraded under the above conditions, and polyamides too are often subjected to photo-degradation.Numerous stabilizers have been hitherto proposed for stabilizing synthetic polymers against photo-degradation, for example benzophenone and benzotriazole compounds for polyolefins, phenol and benzophenone compounds for polyurethanes, and salts of barium or cadmium and organic tin compounds for polyvinyl chloride and polyvinylidene chloride.